The National Weather Service issued a flash flood watch, extended until 2 p.m. Wednesday, for much of Southern New England.
“Multiple waves of showers and thunderstorms will move across Southern New England through Wednesday afternoon.” the flood watch said.
“A lot of things have to come together,” said National Weather Service meteorologist Bill Simpson, but there is “the potential for torrential downpours and gusty winds. . . . We expect [flash flooding] is a possibility in any of these storms.”
The forecasters also issued small craft advisories to boaters in the waters off Massachusetts.
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The chance of heavy rain and thunderstorms persists through Tuesday and into Wednesday. Tuesday will likely be overcast and rainy all day, with daytime temperatures rising to the low 80s and overnight lows reaching the upper 60s.
“The greatest risk appears to be late Tuesday into Wednesday,” the flash flood watch said.
By Wednesday, the chance for thunderstorms will probably be contained to early in the day, with the biggest threat being before 2 p.m. Wednesday afternoon into Wednesday night, showers are likely, though mainly before 8 p.m. Clouds will persist, with low temperatures falling to the mid-60s.
Skies will begin to clear by Thursday, Simpson said, and temperatures will be below normal for this time of year, only rising to the upper 70s. The same sunny skies and cool temperatures are likely to roll over into Friday.